Career
John Muir spent the years 1890-1892 studying Arts and Medicine at the University of Street Andrews. He enrolled at the University of Edinburgh in 1892, obtaining a Bachelor of Medicine and Certificated Master in 1896, and an Doctor of Medicine in 1902. In 1896 he came to South Africa and practised at Worcester, Strydenburg, Sterkstroom and Albertinia before settling in Riversdale.
He collected plants extensively in the area as well as seeds found along the coastline.
He retired in 1923 to devote himself to these interests as well as the study of shells. He donated his collection of driftseeds to Stellenbosch University in 1929 for which he was awarded an honorary Doctor of Science
As the recipient of a Carnegie Travelling Grant, he went abroad to study other collections of ocean-borne fruits and seeds. He presented his herbarium to the National Herbarium, Pretoria.
At this time he developed an interest in folklore and historical objects and published a number of papers on the subject, besides contributing vernacular names of birds, plants and shells to the Woordeboek van die Afrikaanse Taal.
He donated his collection of shells to the South African Museum, some particularly minute species exciting a large amount of interest. Besides his botanical writings, he contributed a number of articles to popular scientific and socio-historical publications, a fair portion of these written in Afrikaans. He is commemorated in the genus Muiria North.E.Br. and in many species such as Leucospermum muirii Phillips, Erica muirii L.Bol., Leucadendron muirii Phillips and Conophytum muirii North.E.Br.
Volume
17 of Flowering Plants of South Africa is dedicated to him.